Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31638189a8d44f37d0f508f3becc04f0c00d6fbfe73b269132549f8e7fe8f52c' 
  AND token = 'lR8tK9TaYtatrbHOqImG4kZ4X6FTvnWZ6LkWFZI5iSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}